The sunlight at noon minimizes shadows but enhances subtle differences in surface brightness. The dark material is mare basalt, a volcanic rock that formed when lava erupted and flooded large impact basins early in the Moon’s history.
The sunlight at noon minimizes shadows but enhances subtle differences in surface brightness. The dark material is mare basalt, a volcanic rock that formed when lava erupted and flooded large impact basins early in the Moon’s history.